Air Suspension Module

WARNING: This page is about a different car, the 2006 Mercury Grand Marquis and 2006 Ford Crown Victoria. However, it is still accessible from the selected car via links, so may be relevant.

CAUTION: Before diagnosing the air suspension system, carry out the air suspension module self-test. If a DTC is present, follow the diagnosis and testing procedures. If no DTC is present, check the vehicle ride height by following the RIDE HEIGHT ADJUSTMENTS .
If the system cannot reach the correct ride height, check all of the air supply lines and connections for leaks/blockage/or damage, height sensor integrity and/or compressor relay operation before installing a new air compressor.

A microprocessor controls the air suspension system. The microprocessor and its supporting hardware are contained in the air suspension module. The air suspension module responds to signals from various sensors in the vehicle to maintain the programmed ride height while the vehicle is either moving or stopped. The air suspension module accomplishes this by opening and closing solenoid valves to control the amount of air in the air spring(s). The air suspension module turns on the compressor by applying voltage through the compressor relay to inflate the air spring(s) and raise the vehicle. The air suspension module opens the vent solenoid to lower the vehicle by releasing air from the air spring(s) in response to signal inputs from the air suspension height sensor.

The air suspension module has a preprogrammed trim height. Whenever a door is opened, the air suspension will compensate in order to bring the vehicle back to the preprogrammed trim height.